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using System;
using System.Collections.Generic;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAPI;


namespace XenAdmin.Actions
{
    public class CreateSriovAction : PureAsyncAction
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        XenAPI.Network newNetwork;
        private List<PIF> selectedPifs;

        public CreateSriovAction(IXenConnection connection, XenAPI.Network newNetwork, List<XenAPI.PIF> pifs)
            : base(connection,
                string.Format(Messages.NETWORK_ACTION_CREATING_NETWORK_TITLE, newNetwork.Name(), Helpers.GetName(connection)))
        {
            this.newNetwork = newNetwork;
            this.selectedPifs = pifs;
        }

        protected override void Run()
        {  
            PIF pifOnMaster =null;

            if (selectedPifs.Count == 0)
                return;

            foreach (PIF thePif in selectedPifs)
            {
                Host host = thePif.Connection.Resolve<XenAPI.Host>(thePif.host);
                if (host == null)
                    continue;

                if (host.IsMaster())
                {
                    pifOnMaster = thePif;
                    break;
                }
            }
            Connection.ExpectDisruption = true;

            //Enable SR-IOV network on Pool requires enabling master first.
            if (pifOnMaster != null)
            {
                selectedPifs.Remove(pifOnMaster);
                selectedPifs.Insert(0, pifOnMaster);
            }

            int inc = 100 / selectedPifs.Count;
            int lo = 0;

            // Create the new network            
            XenRef<XenAPI.Network> networkRef = XenAPI.Network.create(Session, newNetwork);

            try
            {
                foreach (PIF thePif in selectedPifs)
                {
                    RelatedTask = Network_sriov.async_create(Session, thePif.opaque_ref, networkRef);
                    PollToCompletion(lo, lo + inc);
                    lo += inc;
                }
            }
            catch(Exception)
            {
                if(lo == 0)
                    DestroyNetwork(networkRef);
                throw;
            }
        }

        protected override void Clean()
        {
            Connection.ExpectDisruption = false;
        }

        private void DestroyNetwork(string network)
        {
            try
            {
                XenAPI.Network.destroy(Session, network);
            }
            catch (Exception exn)
            {
                log.Warn(exn, exn);
            }
        }

    }
}
